话不多说上代码
public class MainActivity extends AppCompatActivity {
private Button cunn;
private Button xian;
private ImageView ttt;
//private EditText rrr;
public static final int EXTERNAL_STORAGE_REQ_CODE = 10 ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cunn =(Button)findViewById(R.id.cun);
xian=(Button)findViewById(R.id.xians);
ttt=(ImageView)findViewById(R.id.tt);
// rrr=(EditText)findViewById(R.id.rr);
//final Intent intent = new Intent(MainActivity.this,Download.class);
final MyDownloadManager myDownloadManager =